Starred In Such Shows As

He was introduced on the series as a guest star during season 4 but was later promoted to a series regular for seasons 5 and 6 before being demoted again during seasons 7 and 8 and then he was promoted to a series regular again for season 9 to present.

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Background

Collins is an American actor who has appeared in episodes of 24, NCIS and ER, as well as the movies Par 6 and Karla. He also had a starring role in the made-for-television movie Stonehenge Apocalypse, where he played scientist Jacob Glaser.